LatencyInfo trace_id_ no longer dependent on sequence_number.

ui/latency/ipc/latency_info_param_traits_unittest.cc

Index: ui/latency/ipc/latency_info_param_traits_unittest.cc
diff --git a/ui/latency/ipc/latency_info_param_traits_unittest.cc b/ui/latency/ipc/latency_info_param_traits_unittest.cc
index b41a10ad8c66ab323f3fc3ade730a73b65b070db..1ee72ecaef001a786c077b6cf159c785ca667a1d 100644
--- a/ui/latency/ipc/latency_info_param_traits_unittest.cc
+++ b/ui/latency/ipc/latency_info_param_traits_unittest.cc
@@ -15,13 +15,14 @@ namespace ui {
 
 TEST(LatencyInfoParamTraitsTest, Basic) {
   LatencyInfo latency;
+  latency.set_trace_id(5);
   ASSERT_FALSE(latency.terminated());
   latency.AddLatencyNumber(INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT, 1234, 0);
   latency.AddLatencyNumber(INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT, 1234, 100);
   latency.AddLatencyNumber(INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT,
                            1234, 0);
 
-  EXPECT_EQ(100, latency.trace_id());
+  EXPECT_EQ(5, latency.trace_id());
   EXPECT_TRUE(latency.terminated());
 
   IPC::Message msg(1, 2, IPC::Message::PRIORITY_NORMAL);